I had an internal scan to check my ovarians. Not exactly pleasant, but not painful. Less uncomfortable than a smear test.
Because of abnormalities they did an endoscopy, one through my cervix and one through a nick in my tummy button. But it was under full anaesthetic and not painful at all. (Take your own food with you though, the hospital food was dreadful). The result was level three endometriosis, but thankfully not ovarian cancer. The waiting to find out was horrible. I like knitting when I'm stuck in a hospital, it gives my hands something to do when I can't concentrate enough to read anything.
All the best to you.